package edu.whu.MagicNote.interceptor;

import edu.whu.MagicNote.property.JwtProperties;
import edu.whu.MagicNote.security.JwtTokenUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

@Component
@Slf4j
public class JwtInterceptor implements HandlerInterceptor {
    @Autowired
    private JwtTokenUtil tokenUtil;

    @Autowired
    private JwtProperties jwtProperties;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getHeaderName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Map<String, Object> claims = tokenUtil.getClaimFromToken(token);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
